"politicsnation" with al sharpton starts right now. >>> thanks, chris, and thanks to you for tuning in. tonight's lead, four fallen american heroes return home. a heartbreaking and solemn scene today at andrews air force base. four caskets draped with american flags came off the plane preparing for their final resting place, the caskets scarying patriots are who lost their lives in libya this week. president obama and secretary of state hillary clinton honoring the lives of ambassador chris stevens, sean smith, gl glen doherty and tyrone woods. the president talked about their great sacrifice and made it clear they would never be forgotten. >> four americans, four patriots, they loved this country and they chose to serve it and served it well. they had a mission and they believed in it. they knew the danger and they accepted it. they didn't simply embrace the american ideal, they lived it. they embodied it. the courage, the hope, and, yes, the idealism, that fundamental american belief that we can leave this world a little better than before. that's who they were and that's who we are.